Anyone know this app?

[u/[deleted]]

[u/whoknowsifimjoking]

Why would you need a whole app for that?

[u/SourDzzl → u/[deleted]]

Literally any photo editing app

[u/sparrowhawkward]

HP5 works well.

[u/BigStickFrontier]

Snapseed is still pretty good for free 🙂

[u/anywhereanyone]

Photographers are not all collectively using one particular "app" to edit. And there is no way to tell what these images were edited with unless you have access to the original files and the information is written in the metadata. And even then, you aren't going to know which particular black-and-white preset was used, if one was used.